中文核心期刊
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重庆交通大学学报（自然科学版）

重庆交通大学学报（自然科学版） ›› 2010, Vol. 29 ›› Issue (3): 340-343.

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大跨度钢管混凝土拱桥施工阶段稳定性分析

沈培文1,周水兴1,罗飞2   

  1. 1.重庆交通大学土木建筑学院, 重庆 400074;2.四川路桥集团大桥分公司, 四川 成都 610071
  • 收稿日期:2009-12-01 修回日期:2010-02-25 出版日期:2010-06-15 发布日期:2015-01-22
  • 作者简介:沈培文(1985—),男, 重庆綦江人, 硕士研究生, 从事桥梁设计理论研究。E-mail:peiwenshen@163.com。

Stability Analysis on Large-Span CFST Arch Bridge at Construction Stage

SHEN Pei-wen1,ZHOU Shui-xing1,LUO Fei2   

  1. 1.School of Civil Engineering & Architecture,Chongqing Jiaotong University,Chongqing 400074,China;2.Bridge Engineering Branch,Sichuan Road & Bridge Group,Chengdu 610071,Sichuan,China
  • Received:2009-12-01 Revised:2010-02-25 Online:2010-06-15 Published:2015-01-22

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摘要： 以新龙门大桥为工程依托,考虑钢管和混凝土的三向受力本构关系,利用ANSYS建立了空间有限元模型,从 特征值屈曲、几何非线性失稳、几何材料双重非线性失稳3个方面分析了该桥整个施工阶段的稳定问题。结果表 明:钢管混凝土拱桥在整个施工过程中受稳定性影响较大,稳定系数有不断下降的趋势,考虑双重非线性的稳定系 数与特征值屈曲分析相比差别较大,最大可达30%。

关键词: 钢管混凝土拱桥, 施工阶段, 稳定性, 本构关系, 屈曲, 非线性失稳

Abstract: The stability of concrete filled steel tubular (CFST) arch bridge at construction stage is concerned by engineers. Based on the Xinlongmen Bridge, considering the constititive relationship between steel tube and concrete, spatial finite el- ement model is established by ANSYS. The stability of Xinlongmen Bridge at construction phase is analyzed from three as- pects of eigenvalue buckling, geometric nonlinear instability, geometric and material double nonlinear instability.The re- sults show that CFST arch bridge is greatly influenced by the stability during consruction stage, and there is a downward trend of stability coefficient; meanwhile, a large difference exists between double nonlinear srability coefficients and eigen- value buckling coefficients which can get up to 30% at maximun.

Key words: CFST arch bridge;conshuction stage, stability, constitutive relationship, buckling, nonlinear instability

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